Renesas R5F10266GSM#55

Overview

R5F10266GSM#55 from Renesas is a 20-pin RL78/G12 16-bit microcontroller designed for ultra-low-power industrial embedded control, featuring 2 KB code flash, 256 B RAM, 2 KB data flash, 10-bit A/D converter (11 channels), and operation from −40°C to +105°C. It integrates UART, two CSI channels, two simplified I²C channels, four 16-bit timer channels, and supports HALT/STOP/SNOOZE low-power modes with 63 μA/MHz active current.

For engineers reviewing the R5F10266GSM#55 datasheet, R5F10266GSM#55 pinout, R5F10266GSM#55 application, or R5F10266GSM#55 equivalent, key selection considerations include its G-grade industrial temperature rating, absence of self-programming capability, TSSOP20 package with 0.65-mm pitch, and compatibility with Renesas' RL78 development ecosystem including CS+ and e² studio.

Technical Context

The R5F10266GSM#55 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and selectable high-speed on-chip oscillator (1–24 MHz, ±1.0% accuracy at −20°C to +85°C). Its peripheral set includes CRC calculation unit, RAM guard, SFR guard, and background operation (BGO) for data flash rewriting while executing program code.

It operates across 1.8–5.5 V supply, supports different-potential interface (1.8/2.5/3.0 V logic), and features dedicated low-speed on-chip oscillator (15 kHz) for watchdog timer operation independent of main clock. The device lacks DMA controller and safety functions found in higher-pin-count R5F102 variants, aligning with its compact 20-pin TSSOP footprint.

Key Specifications

Pinout & Package

Package: 20-pin plastic TSSOP (4.4 × 6.5 mm, 0.65-mm pitch), JEDEC standard PTSP0020JI-A, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F10267GSM#55, the R5F10266GSM#55 trades RAM headroom for minimal die size and cost; versus R5F10366GSM#55, it provides essential industrial-grade reliability features - data flash persistence, CRC, and memory protection - at identical package and footprint.

Availability

R5F10266GSM#55 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable power supplies, and industrial HMI panels requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F10266GSM#55 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications, with annual revenue exceeding $10 billion.

The RL78/G12 product line delivers true low-power 16-bit MCU performance for cost-sensitive industrial and consumer control applications, emphasizing energy efficiency, integrated analog, and functional safety readiness.

FAQ

What is the maximum operating frequency and clock source flexibility of the R5F10266GSM#55?

The R5F10266GSM#55 supports a maximum system clock of 24 MHz using its high-speed on-chip oscillator, with accuracy of ±1.0% over −20°C to +85°C (and ±2.0% at full −40°C to +105°C range). It also accepts external crystal (X1/X2, 1–20 MHz) or external clock (EXCLK) inputs. The RL78 core executes instructions in as little as 0.04167 µs at 24 MHz, enabling real-time control loops in the R5F10266GSM#55.

Does the R5F10266GSM#55 support self-programming of its flash memory?

No, the R5F10266GSM#55 does not support self-programming of code flash memory, as explicitly stated in the datasheet Note 2 under "ROM, RAM capacities" (Page 2). While it includes 2 KB of data flash memory with background operation (BGO), the self-programming function is disabled for this specific variant. Applications requiring field firmware updates must use external memory or alternative RL78 variants like R5F10267GSM#55.

What are the analog capabilities of the R5F10266GSM#55, and how are they implemented?

The R5F10266GSM#55 integrates an 11-channel, 10-bit successive-approximation A/D converter with internal 1.45 V reference voltage and an on-chip temperature sensor. Analog inputs ANI0–ANI3 and ANI16–ANI22 are mapped to dedicated pins (e.g., P20–P23, P10–P14, P41–P42), supporting single-ended or differential acquisition. The AVREFP/AVREFM pins provide precision reference, and the converter operates across the full 1.8–5.5 V supply range - all confirmed in the R5F10266GSM#55's electrical specifications and block diagram.

How does the R5F10266GSM#55 handle low-power operation, and what modes are available?

The R5F10266GSM#55 offers three ultra-low-power modes: HALT (CPU stopped, peripherals active), STOP (all clocks halted except low-speed oscillator), and SNOOZE (selected peripherals remain active during CPU sleep). Active current is specified at 63 μA/MHz, and the device achieves sub-μA stop-mode current. These modes are controlled via software registers and support wake-up via external interrupts (INTP0–INTP3), timer events, or serial activity - critical for battery-operated R5F10266GSM#55 deployments.

Is the R5F10266GSM#55 pin-compatible with other RL78/G12 devices in the same package?

Yes, the R5F10266GSM#55 is fully pin-compatible with other 20-pin TSSOP RL78/G12 devices sharing the same suffix (e.g., R5F10267GSM#55, R5F10268GSM#55), as confirmed by identical pin configuration diagrams (Page 7) and shared package code PTSP0020JI-A. All share identical pin functions, electrical characteristics, and mechanical footprint - enabling drop-in replacement where memory or peripheral requirements align.